These bacteria usually enter the body through foods and live in the stomach and other parts of the digestive tract. After several months to years, H. pylori cause sores, known as ulcers, in the mucosa of the stomach and the upper part of the small intestine. If not treated in a timely manner, the infection may progress further leading to stomach cancer.
This marks the need to detect H.Pylori infection and seek appropriate treatment to clear it in a safe and effective manner.
H.Pylori: Major cause of peptic ulcers
H. Pylori is a major cause of peptic ulcers. Peptic ulcer refers to a condition caused due to ulceration in the mucosa of the stomach and intestine.
For several decades, doctors and scientists believed that peptic ulcers are caused due to excessive intake of spicy foods, smoking, mental stress, and other lifestyle habits. However, it was in 1982 that H. pylori was discovered to be the major cause of peptic ulcers in most patients.
When H.Pylori bacteria enter the body, they attack the stomach mucosa, which usually protects the stomach from the acidic secretions produced to digest food. Once the bacteria have caused enough damage, the stomach acid can then pass through the lining eroding deeper into the mucosa leading to the development of ulcers.
The ulcers can cause severe symptoms like heartburn, nausea, vomiting, and stomach pain. They may also bleed, and keep the food from moving through the digestive tract.
What are the causes and risk factors for H. pylori infection?
Most patients get H.Pylori during childhood, though the infection can begin in adulthood too. The bacteria reside in the body for several years before the symptoms start to become evident. 
Children and young adults are more likely to develop H. pylori infections. The higher prevalence in children could be attributed to the lack of proper hygiene.
H.Pylori usually enter the body through the contaminated food, water, and utensils. It is more common in communities and countries that lack clean water facilities or efficient sewage systems. The bacteria may also enter the body due to the direct contact with the body fluids of infected people such as saliva, vomit, and stool.  
The environmental conditions such as living in overcrowded places and sharing a house with someone who has contracted this infection can also influence the risk of H. pylori.